===================================================================
@@ -30,10 +30,14 @@ int pci_probe_reset_function(struct pci_
* platform; to be used during system-wide transitions from a
* sleeping state to the working state and vice versa
*
- * @can_wakeup: returns 'true' if given device is capable of waking up the
- * system from a sleeping state
+ * @can_wakeup: returns 'true' if the plaform can generate wake-up events for
+ * given device.
*
- * @sleep_wake: enables/disables the system wake up capability of given device
+ * @sleep_wake: enables/disables the wake-up capability of given device
+ *
+ * @run_wake: enables/disables the platform to generate run-time wake-up events
+ * for given device (the device's wake-up capability has to be
+ * enabled by @sleep_wake for this feature to work)
*
* If given platform is generally capable of power managing PCI devices, all of
* these callbacks are mandatory.
@@ -44,16 +48,25 @@ struct pci_platform_pm_ops {
pci_power_t (*choose_state)(struct pci_dev *dev);
bool (*can_wakeup)(struct pci_dev *dev);
int (*sleep_wake)(struct pci_dev *dev, bool enable);
+ int (*run_wake)(struct pci_dev *dev, bool enable);
};
extern int pci_set_platform_pm(struct pci_platform_pm_ops *ops);
+extern int pci_platform_run_wake(struct pci_dev *dev, bool enable);
extern void pci_update_current_state(struct pci_dev *dev, pci_power_t state);
extern void pci_disable_enabled_device(struct pci_dev *dev);
extern bool pci_check_pme_status(struct pci_dev *dev);
+extern int __pci_pme_wakeup(struct pci_dev *dev, void *ign);
+extern void pci_pme_wakeup_bus(struct pci_bus *bus);
extern void pci_pm_init(struct pci_dev *dev);
extern void platform_pci_wakeup_init(struct pci_dev *dev);
extern void pci_allocate_cap_save_buffers(struct pci_dev *dev);
+static inline void pci_pme_wakeup(struct pci_dev *dev)
+{
+ __pci_pme_wakeup(dev, NULL);
+}
+
static inline bool pci_is_bridge(struct pci_dev *pci_dev)
{
return !!(pci_dev->subordinate);
===================================================================
@@ -19,6 +19,682 @@
#include "pci.h"
/*
+ * ACPI-based PCI run-time power management uses ACPI system notify handlers,
+ * which are also used by ACPI-based PCI hotplug. Unfortunately, however, there
+ * can be only one ACPI system notify handler installed for an ACPI device
+ * handle. For this reason there has to be a way to use the same notify handler
+ * for both ACPI-based hotplug and ACPI-based run-time PM.
+ *
+ * Moreover, there may be many PCI devices, including bridges, that share one
+ * wake-up GPE and if a wake-up event is signaled for a bridge, we will check
+ * the PME status of all devices below it, so if a device below a bridge shares
+ * a wake-up GPE with the bridge, it only makes sense to install a notify
+ * handled for the bridge, because the device is going to be checked anyway in
+ * the process of handling the bridge notification. In particular, if any
+ * devices share a wake-up GPE with the root bridge, there only need to be a
+ * notify handler for the root bridge, because the other devices will be checked
+ * in the process of handling the root bridge wake-up.
+ *
+ * Furthermore, if many devices share one wake-up GPE, we only need to install
+ * a notify handler for one of them as long as we know which devices to check
+ * in the process of handling the notification. The purpose of the data
+ * structures and helper functions below is to arrange things in accordance with
+ * these observations.
+ *
+ * pci_acpi_runtime_notifiers is a list of struct pci_acpi_notifier_block
+ * objects that each represent ACPI devices that have ACPI system notify
+ * handlers installed. For each of them, there is a ACPI-based hotplug notifier
+ * to execute for hotplug events, hp_cb, and a pointer to the data to pass to it
+ * hp_data, as well as a list of PCI buses and a list of PCI devices for which
+ * to execute PME handlers in the case of ACPI-based PM events. Since every
+ * object may represent multiple PCI devices and/or buses to handle if power
+ * management event is signaled via the GPE associated with it, there are
+ * reference counters for tracking the usage of each object.
+ */
+
+static LIST_HEAD(pci_acpi_runtime_notifiers);
+static DEFINE_MUTEX(pci_acpi_notifier_mtx);
+
+struct pci_acpi_notifier_block
+{
+ struct list_head entry;
+ struct acpi_device *dev;
+ acpi_notify_handler hp_cb;
+ void *hp_data;
+ struct list_head pm_buses;
+ struct list_head pm_devices;
+ int pm_enable_count;
+};
+
+struct pci_bus_notifier_entry
+{
+ struct list_head entry;
+ struct pci_bus *bus;
+ int enable_count;
+};
+
+struct pci_dev_notifier_entry
+{
+ struct list_head entry;
+ struct pci_dev *dev;
+ bool enabled;
+};
+
+/**
+ * pci_acpi_event_fn - Universal system notification handler.
+ * @handle: ACPI handle of a device the notification is for.
+ * @event: Type of the signaled event.
+ * @data: Context data, should be a pointer to a notifier object.
+ *
+ * Take the address on a notifier object from @data and use it to extract the
+ * information needed for handling the event. If this is a wake-up event,
+ * check if PM notification is enabled for this notifier object and, if so,
+ * execute the appropriate PME handler for each bus and for each devices that
+ * should be checked for the PME status. If this is not a wake-up event,
+ * execute the hotplug notify handler for @handle.
+ */
+static void pci_acpi_event_fn(acpi_handle handle, u32 event, void *data)
+{
+ struct pci_acpi_notifier_block *nb = data;
+
+ if (!nb)
+ return;
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ if (event == ACPI_NOTIFY_DEVICE_WAKE && nb->pm_enable_count) {
+ if (!list_empty(&nb->pm_buses)) {
+ struct pci_bus_notifier_entry *bne;
+
+ list_for_each_entry(bne, &nb->pm_buses, entry)
+ if (bne->enable_count)
+ pci_pme_wakeup_bus(bne->bus);
+ }
+ if (!list_empty(&nb->pm_devices)) {
+ struct pci_dev_notifier_entry *dne;
+
+ list_for_each_entry(dne, &nb->pm_devices, entry)
+ if (dne->enabled)
+ pci_pme_wakeup(dne->dev);
+ }
+ } else if (nb->hp_cb) {
+ nb->hp_cb(handle, event, nb->hp_data);
+ }
+
+ mutex_unlock(&pci_acpi_notifier_mtx);
+}
+
+/**
+ * new_notifier - Create a new notifier object for given ACPI device.
+ * @dev: Device to create the notifier object for.
+ */
+static struct pci_acpi_notifier_block *new_notifier(struct acpi_device *dev)
+{
+ struct pci_acpi_notifier_block *nb;
+
+ nb = kzalloc(sizeof(*nb), GFP_KERNEL);
+ if (!nb)
+ return NULL;
+
+ nb->dev = dev;
+ INIT_LIST_HEAD(&nb->pm_buses);
+ INIT_LIST_HEAD(&nb->pm_devices);
+
+ return nb;
+}
+
+/**
+ * pci_acpi_add_hp_notifier - Register a hotplug notifier for given device.
+ * @handle: ACPI handle of the device to register the notifier for.
+ * @handler: Callback to execute for hotplug events related to @handle.
+ * @context: Pointer to the context data to pass to @handler.
+ *
+ * Use @handle to get an ACPI device object and check if there is a notifier
+ * object for it. If this is the case, add @handler and @context to the
+ * existing notifier object, unless there already is a hotplug handler in this
+ * notifier object. Otherwise, create a new notifier object for the ACPI device
+ * associated with @handle and add @handler and @context to it.
+ */
+acpi_status pci_acpi_add_hp_notifier(acpi_handle handle,
+ acpi_notify_handler handler, void *context)
+{
+ struct pci_acpi_notifier_block *nb;
+ struct acpi_device *dev;
+ acpi_status status = AE_OK;
+
+ if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev)))
+ return AE_NOT_FOUND;
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+ if (nb->dev != dev)
+ continue;
+
+ if (!nb->hp_cb) {
+ nb->hp_cb = handler;
+ nb->hp_data = context;
+ } else {
+ status = AE_ALREADY_EXISTS;
+ }
+ goto out;
+ }
+
+ nb = new_notifier(dev);
+ if (!nb) {
+ status = AE_NO_MEMORY;
+ goto out;
+ }
+ nb->hp_cb = handler;
+ nb->hp_data = context;
+
+ list_add_tail(&nb->entry, &pci_acpi_runtime_notifiers);
+
+ status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+ pci_acpi_event_fn, nb);
+ if (ACPI_FAILURE(status)) {
+ list_del(&nb->entry);
+ kfree(nb);
+ }
+
+ out:
+ mutex_unlock(&pci_acpi_notifier_mtx);
+
+ return status;
+}
+EXPORT_SYMBOL_GPL(pci_acpi_add_hp_notifier);
+
+/**
+ * pci_acpi_remove_hp_notifier - Unregister a hotplug notifier for given device.
+ * @handle: ACPI handle of the device to unregister the notifier for.
+ * @handler: Callback executed for hotplug events related to @handle.
+ *
+ * Find the notifier object associated with @handle and remove the hotplug
+ * callback and the pointer to the hotplug context data from it. If the
+ * notifier object is not necessary any more, remove it altogether.
+ */
+acpi_status pci_acpi_remove_hp_notifier(acpi_handle handle,
+ acpi_notify_handler handler)
+{
+ struct pci_acpi_notifier_block *nb;
+ struct acpi_device *dev;
+ acpi_status status = AE_OK;
+
+ if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev)))
+ return AE_NOT_FOUND;
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry)
+ if (nb->dev == dev)
+ goto found;
+
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return AE_NOT_FOUND;
+
+ found:
+ if (list_empty(&nb->pm_buses) && list_empty(&nb->pm_devices)) {
+ status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+ pci_acpi_event_fn);
+ list_del(&nb->entry);
+ kfree(nb);
+ } else {
+ nb->hp_data = NULL;
+ nb->hp_cb = NULL;
+ }
+
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return status;
+}
+EXPORT_SYMBOL_GPL(pci_acpi_remove_hp_notifier);
+
+/**
+ * bus_match - Check if one PCI bus is upstream from another.
+ * @target: PCI bus expected to be upstream from the other.
+ * @bus: PCI bus expected to be downstream from the other.
+ *
+ * Return 'ture' if @target is upstream with respect to @bus.
+ */
+static inline bool bus_match(struct pci_bus *target, struct pci_bus *bus)
+{
+ return pci_domain_nr(target) == pci_domain_nr(bus)
+ && (pci_is_root_bus(target) || (bus->number >= target->number
+ && bus->number <= target->subordinate));
+}
+
+/**
+ * new_dev_entry - Create a new device notifier entry.
+ * @dev: PCI device to create the entry for.
+ * @list: List to add the new entry to.
+ */
+static struct pci_dev_notifier_entry *new_dev_entry(struct pci_dev *dev,
+ struct list_head *list)
+{
+ struct pci_dev_notifier_entry *dne;
+
+ dne = kzalloc(sizeof(*dne), GFP_KERNEL);
+ if (!dne)
+ return NULL;
+
+ dne->dev = dev;
+ list_add_tail(&dne->entry, list);
+
+ return dne;
+}
+
+/**
+ * pci_acpi_add_device_pm_notifier - Register PM notifier for given device.
+ * @dev: ACPI device to add the notifier for.
+ * @pci_dev: PCI device to check for the PME status if an event is signaled.
+ *
+ * Check if there is a notifier object for @dev and if that is the case, add
+ * @pci_dev to its list of devices whose PME status should be checked if a PM
+ * event is signaled for @dev, unless @pci_dev is covered by one of the buses
+ * in the notifier's bus list. Otherwise, create a new notifier object for @dev
+ * and add @pci_dev to its list of devices whose PME status to check.
+ */
+acpi_status pci_acpi_add_device_pm_notifier(struct acpi_device *dev,
+ struct pci_dev *pci_dev)
+{
+ struct pci_acpi_notifier_block *nb;
+ struct pci_dev_notifier_entry *dne;
+ struct pci_bus *bus = pci_dev->bus;
+ acpi_status status = AE_OK;
+
+ if (!dev->wakeup.flags.valid)
+ return AE_BAD_PARAMETER;
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+ struct pci_bus_notifier_entry *bne;
+
+ if (!acpi_wakeup_gpe_shared(nb->dev, dev))
+ continue;
+
+ list_for_each_entry(bne, &nb->pm_buses, entry)
+ if (bus_match(bne->bus, bus))
+ goto out;
+
+ list_for_each_entry(dne, &nb->pm_devices, entry)
+ if (dne->dev == pci_dev)
+ goto out;
+
+ if (!new_dev_entry(pci_dev, &nb->pm_devices))
+ status = AE_NO_MEMORY;
+ goto out;
+ }
+
+ nb = new_notifier(dev);
+ if (!nb) {
+ status = AE_NO_MEMORY;
+ goto out;
+ }
+
+ dne = new_dev_entry(pci_dev, &nb->pm_devices);
+ if (!dne) {
+ kfree(nb);
+ status = AE_NO_MEMORY;
+ goto out;
+ }
+
+ list_add_tail(&nb->entry, &pci_acpi_runtime_notifiers);
+
+ status = acpi_install_notify_handler(dev->handle, ACPI_SYSTEM_NOTIFY,
+ pci_acpi_event_fn, nb);
+ if (ACPI_FAILURE(status)) {
+ list_del(&dne->entry);
+ kfree(dne);
+ list_del(&nb->entry);
+ kfree(nb);
+ }
+
+ out:
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return status;
+}
+
+/**
+ * pci_acpi_remove_device_pm_notifier - Unregister PM notifier for given device.
+ * @dev: ACPI device to remove the notifier from.
+ * @pci_dev: PCI device whose PME status is checked if an event is signaled.
+ *
+ * Find the notifier object for @dev and remove @pci_dev from its list of
+ * devices whose PME status to check when wake-up event is signaled. If the
+ * notifier object is not necessary any more after that, remove it too.
+ */
+acpi_status pci_acpi_remove_device_pm_notifier(struct acpi_device *dev,
+ struct pci_dev *pci_dev)
+{
+ struct pci_acpi_notifier_block *nb;
+ struct pci_dev_notifier_entry *dne = NULL;
+ acpi_status status = AE_OK;
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+ if (!acpi_wakeup_gpe_shared(nb->dev, dev))
+ continue;
+
+ list_for_each_entry(dne, &nb->pm_devices, entry)
+ if (dne->dev == pci_dev)
+ goto found;
+ }
+
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return AE_NOT_FOUND;
+
+ found:
+ if (dne->enabled) {
+ if (!--nb->pm_enable_count)
+ acpi_device_run_wake(nb->dev, false);
+ }
+ list_del(&dne->entry);
+ kfree(dne);
+
+ if (list_empty(&nb->pm_devices) && list_empty(&nb->pm_buses)
+ && !nb->hp_cb) {
+ status = acpi_remove_notify_handler(nb->dev->handle,
+ ACPI_SYSTEM_NOTIFY,
+ pci_acpi_event_fn);
+ list_del(&nb->entry);
+ kfree(nb);
+ }
+
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return status;
+}
+
+/**
+ * new_bus_entry - Create a new bus notifier entry.
+ * @bus: PCI bus to create the entry for.
+ * @list: List to add the new entry to.
+ */
+static struct pci_bus_notifier_entry *new_bus_entry(struct pci_bus *bus,
+ struct list_head *list)
+{
+ struct pci_bus_notifier_entry *bne;
+
+ bne = kzalloc(sizeof(*bne), GFP_KERNEL);
+ if (!bne)
+ return NULL;
+
+ bne->bus = bus;
+ list_add_tail(&bne->entry, list);
+
+ return bne;
+}
+
+/**
+ * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
+ * @dev: ACPI device to add the notifier for.
+ * @bus: PCI bus to walk if an event is signaled.
+ *
+ * Check if there is a notifier object for @dev and if that is the case, add
+ * @bus to its list of buses to walk, checking the PME status of all devices on
+ * them, if a PM event is signaled for @dev, unless @bus or a PCI bus upstream
+ * with respect to it is in the list already. Otherwise, create a new notifier
+ * object for @dev and add @bus to its list of buses to walk if a PM event is
+ * signaled.
+ */
+acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
+ struct pci_bus *bus)
+{
+ struct pci_acpi_notifier_block *nb;
+ struct pci_bus_notifier_entry *bne;
+ acpi_status status = AE_OK;
+
+ if (!dev->wakeup.flags.valid)
+ return AE_BAD_PARAMETER;
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+ if (!acpi_wakeup_gpe_shared(nb->dev, dev))
+ continue;
+
+ list_for_each_entry(bne, &nb->pm_buses, entry)
+ if (bus_match(bne->bus, bus))
+ goto out;
+
+ if (!new_bus_entry(bus, &nb->pm_buses))
+ status = AE_NO_MEMORY;
+ goto out;
+ }
+
+ nb = new_notifier(dev);
+ if (!nb) {
+ status = AE_NO_MEMORY;
+ goto out;
+ }
+
+ bne = new_bus_entry(bus, &nb->pm_buses);
+ if (!bne) {
+ kfree(nb);
+ status = AE_NO_MEMORY;
+ goto out;
+ }
+
+ list_add_tail(&nb->entry, &pci_acpi_runtime_notifiers);
+
+ status = acpi_install_notify_handler(dev->handle, ACPI_SYSTEM_NOTIFY,
+ pci_acpi_event_fn, nb);
+ if (ACPI_FAILURE(status)) {
+ list_del(&bne->entry);
+ kfree(bne);
+ list_del(&nb->entry);
+ kfree(nb);
+ }
+
+ out:
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return status;
+}
+
+/**
+ * pci_acpi_remove_bus_pm_notifier - Unregister PM notifier for given PCI bus.
+ * @dev: ACPI device to remove the notifier from.
+ * @bus: PCI bus that is walked if an event is signaled.
+ *
+ * Find the notifier object for @dev and remove @bus from its list of buses to
+ * walk when wake-up event is signaled. If the notifier object is not necessary
+ * any more after that, remove it too.
+ */
+acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev,
+ struct pci_bus *bus)
+{
+ struct pci_acpi_notifier_block *nb;
+ struct pci_bus_notifier_entry *bne = NULL;
+ acpi_status status = AE_OK;
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+ if (!acpi_wakeup_gpe_shared(nb->dev, dev))
+ continue;
+
+ list_for_each_entry(bne, &nb->pm_buses, entry)
+ if (bne->bus == bus)
+ goto found;
+ }
+
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return AE_NOT_FOUND;
+
+ found:
+ if (bne->enable_count) {
+ nb->pm_enable_count -= bne->enable_count;
+ if (!nb->pm_enable_count)
+ acpi_device_run_wake(nb->dev, false);
+ }
+ list_del(&bne->entry);
+ kfree(bne);
+
+ if (list_empty(&nb->pm_devices) && list_empty(&nb->pm_buses)
+ && !nb->hp_cb) {
+ status = acpi_remove_notify_handler(nb->dev->handle,
+ ACPI_SYSTEM_NOTIFY,
+ pci_acpi_event_fn);
+ list_del(&nb->entry);
+ kfree(nb);
+ }
+
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return status;
+}
+
+/**
+ * dev_run_wake - Enable/disable the GPE associated with given notifier.
+ * @nb: Notifier to enable/disable the GPE for.
+ * @dne: Device notifier entry for the device being enabled/disabled to wake-up.
+ * @enable: Whether to enable or disable the GPE.
+ */
+static int dev_run_wake(struct pci_acpi_notifier_block *nb,
+ struct pci_dev_notifier_entry *dne, bool enable)
+{
+ int error = 0;
+
+ if (enable) {
+ dne->enabled = true;
+ if (!nb->pm_enable_count++)
+ acpi_device_run_wake(nb->dev, true);
+ } else if (dne->enabled) {
+ dne->enabled = false;
+ if (!--nb->pm_enable_count)
+ acpi_device_run_wake(nb->dev, false);
+ } else {
+ error = -EALREADY;
+ }
+
+ return error;
+}
+
+/**
+ * bus_run_wake - Enable/disable the GPE associated with given notifier.
+ * @nb: Notifier to enable/disable the GPE for.
+ * @bne: Bus notifier entry for a bridge being enabled/disabled to wake-up.
+ * @enable: Whether to enable or disable the GPE.
+ */
+static int bus_run_wake(struct pci_acpi_notifier_block *nb,
+ struct pci_bus_notifier_entry *bne, bool enable)
+{
+ int error = 0;
+
+ if (enable) {
+ bne->enable_count++;
+ if (!nb->pm_enable_count++)
+ acpi_device_run_wake(nb->dev, true);
+ } else if (bne->enable_count) {
+ bne->enable_count--;
+ if (!--nb->pm_enable_count)
+ acpi_device_run_wake(nb->dev, false);
+ } else {
+ error = -EALREADY;
+ }
+
+ return error;
+}
+
+/**
+ * __acpi_dev_run_wake - Enable/disable wake-up for given PCI device.
+ * @pci_dev: Device to enable/disable the platform to wake-up the system for.
+ * @enable: Whether enable or disable the wake-up functionality.
+ *
+ * Find the notifier object corresponding to @pci_dev and try to enable/disable
+ * the GPE associated with it.
+ */
+static int __acpi_dev_run_wake(struct pci_dev *pci_dev, bool enable)
+{
+ struct pci_acpi_notifier_block *nb;
+ struct pci_bus *bus = pci_dev->bus;
+ struct acpi_device *dev;
+ acpi_handle handle;
+ int error = -ENODEV;
+
+ if (!device_can_wakeup(&pci_dev->dev))
+ return -EINVAL;
+
+ handle = DEVICE_ACPI_HANDLE(&pci_dev->dev);
+ if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
+ dev_dbg(&pci_dev->dev, "ACPI handle has no context in %s!\n",
+ __func__);
+ return -ENODEV;
+ }
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+ struct pci_bus_notifier_entry *bne;
+ struct pci_dev_notifier_entry *dne;
+
+ if (!acpi_wakeup_gpe_shared(nb->dev, dev))
+ continue;
+
+ list_for_each_entry(bne, &nb->pm_buses, entry)
+ if (bus_match(bne->bus, bus)) {
+ error = bus_run_wake(nb, bne, enable);
+ goto out;
+ }
+
+ list_for_each_entry(dne, &nb->pm_devices, entry)
+ if (dne->dev == pci_dev) {
+ error = dev_run_wake(nb, dne, enable);
+ goto out;
+ }
+ }
+
+ out:
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return error;
+}
+
+/**
+ * __acpi_bridge_run_wake - Enable/disable wake-up for given bridge.
+ * @bridge: Bridge to enable/disable the platform to wake-up the system for.
+ * @enable: Whether enable or disable the wake-up functionality.
+ *
+ * Find the notifier object corresponding to @bridge and try to enable/disable
+ * the GPE associated with it, under the assumption that @bridge may be a PCI
+ * root bridge.
+ */
+static int __acpi_bridge_run_wake(struct device *bridge, bool enable)
+{
+ struct pci_acpi_notifier_block *nb;
+ struct acpi_device *dev;
+ acpi_handle handle;
+ int error = -ENODEV;
+
+ if (!device_can_wakeup(bridge))
+ return -EINVAL;
+
+ handle = DEVICE_ACPI_HANDLE(bridge);
+ if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
+ dev_dbg(bridge, "ACPI handle has no context in %s!\n",
+ __func__);
+ return -ENODEV;
+ }
+
+ mutex_lock(&pci_acpi_notifier_mtx);
+
+ list_for_each_entry(nb, &pci_acpi_runtime_notifiers, entry) {
+ struct pci_bus_notifier_entry *bne;
+
+ if (!acpi_wakeup_gpe_shared(nb->dev, dev))
+ continue;
+
+ list_for_each_entry(bne, &nb->pm_buses, entry)
+ if (bne->bus->bridge == bridge) {
+ error = bus_run_wake(nb, bne, enable);
+ goto out;
+ }
+ }
+
+ out:
+ mutex_unlock(&pci_acpi_notifier_mtx);
+ return error;
+}
+
+/*
* _SxD returns the D-state with the highest power
* (lowest D-state number) supported in the S-state "x".
*
@@ -137,12 +813,42 @@ static int acpi_pci_sleep_wake(struct pc
return 0;
}
+static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
+{
+ while (bus->parent) {
+ struct pci_dev *bridge = bus->self;
+
+ if (pcie_pme_enabled(bridge))
+ return;
+ if (!__acpi_dev_run_wake(bridge, enable))
+ return;
+ bus = bus->parent;
+ }
+
+ /* We have reached the root bus. */
+ if (bus->bridge)
+ __acpi_bridge_run_wake(bus->bridge, enable);
+}
+
+static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
+{
+ if (pcie_pme_enabled(dev))
+ return 0;
+
+ if (acpi_pci_can_wakeup(dev))
+ return __acpi_dev_run_wake(dev, enable);
+
+ acpi_pci_propagate_run_wake(dev->bus, enable);
+ return 0;
+}
+
static struct pci_platform_pm_ops acpi_pci_platform_pm = {
.is_manageable = acpi_pci_power_manageable,
.set_state = acpi_pci_set_power_state,
.choose_state = acpi_pci_choose_state,
.can_wakeup = acpi_pci_can_wakeup,
.sleep_wake = acpi_pci_sleep_wake,
+ .run_wake = acpi_pci_run_wake,
};
/* ACPI bus type */
===================================================================
@@ -21,6 +21,7 @@
#include <linux/interrupt.h>
#include <asm/dma.h> /* isa_dma_bridge_buggy */
#include <linux/device.h>
+#include <linux/pm_runtime.h>
#include <asm/setup.h>
#include "pci.h"
@@ -434,6 +435,12 @@ static inline int platform_pci_sleep_wak
pci_platform_pm->sleep_wake(dev, enable) : -ENODEV;
}
+int pci_platform_run_wake(struct pci_dev *dev, bool enable)
+{
+ return pci_platform_pm ?
+ pci_platform_pm->run_wake(dev, enable) : -ENODEV;
+}
+
/**
* pci_raw_set_power_state - Use PCI PM registers to set the power state of
* given PCI device
@@ -1202,6 +1209,31 @@ bool pci_check_pme_status(struct pci_dev
}
/**
+ * pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set.
+ * @dev: Device to handle.
+ * @ign: Ignored.
+ *
+ * Check if @dev has generated PME and queue a resume request for it in that
+ * case.
+ */
+int __pci_pme_wakeup(struct pci_dev *dev, void *ign)
+{
+ if (pci_check_pme_status(dev))
+ pm_request_resume(&dev->dev);
+ return 0;
+}
+
+/**
+ * pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary.
+ * @bus: Top bus of the subtree to walk.
+ */
+void pci_pme_wakeup_bus(struct pci_bus *bus)
+{
+ if (bus)
+ pci_walk_bus(bus, __pci_pme_wakeup, NULL);
+}
+
+/**
* pci_pme_capable - check the capability of PCI device to generate PME#
* @dev: PCI device to handle.
* @state: PCI state from which device will issue PME#.
===================================================================
@@ -124,6 +124,56 @@ void acpi_disable_wakeup_device(u8 sleep
}
}
+#ifdef CONFIG_PM_WAKEUP
+/**
+ * acpi_device_run_wake - Enable/disable ACPI BIOS to generate wake-up events.
+ * @dev: Device to generate the wake-up events for.
+ * @enable: Desired action.
+ *
+ * If @enable is set, set up the GPE associated with @phys_dev to generate
+ * wake-up events at run time. If @enable is unset, disable the GPE associated
+ * with @phys_dev (unless it is marked as a run-wake device).
+ */
+int acpi_device_run_wake(struct acpi_device *dev, bool enable)
+{
+ if (!dev || !dev->wakeup.flags.valid)
+ return -EINVAL;
+
+ if (enable) {
+ if (!dev->wakeup.state.enabled && !dev->wakeup.prepare_count)
+ return -EINVAL;
+
+ acpi_set_gpe_type(dev->wakeup.gpe_device,
+ dev->wakeup.gpe_number,
+ ACPI_GPE_TYPE_WAKE_RUN);
+ acpi_enable_gpe(dev->wakeup.gpe_device,
+ dev->wakeup.gpe_number);
+ } else if (!dev->wakeup.flags.run_wake) {
+ acpi_set_gpe_type(dev->wakeup.gpe_device,
+ dev->wakeup.gpe_number,
+ ACPI_GPE_TYPE_WAKE);
+ acpi_disable_gpe(dev->wakeup.gpe_device,
+ dev->wakeup.gpe_number);
+ acpi_clear_gpe(dev->wakeup.gpe_device,
+ dev->wakeup.gpe_number, ACPI_NOT_ISR);
+ }
+
+ return 0;
+}
+
+/**
+ * acpi_wakeup_gpes_shared - Check if given ACPI devices share a wake-up GPE.
+ * @deva: First ACPI device to check.
+ * @devb: Second ACPI device to check.
+ */
+bool acpi_wakeup_gpe_shared(struct acpi_device *deva, struct acpi_device *devb)
+{
+ return deva->wakeup.flags.valid && devb->wakeup.flags.valid
+ && deva->wakeup.gpe_device == devb->wakeup.gpe_device
+ && deva->wakeup.gpe_number == devb->wakeup.gpe_number;
+}
+#endif /* CONFIG_PM_WAKEUP */
+
int __init acpi_wakeup_device_init(void)
{
struct list_head *node, *next;
===================================================================
@@ -386,21 +386,35 @@ acpi_handle acpi_get_pci_rootbridge_hand
struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle);
#define DEVICE_ACPI_HANDLE(dev) ((acpi_handle)((dev)->archdata.acpi_handle))
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_PM_WAKEUP
int acpi_pm_device_sleep_state(struct device *, int *);
int acpi_pm_device_sleep_wake(struct device *, bool);
-#else /* !CONFIG_PM_SLEEP */
+int acpi_device_run_wake(struct acpi_device *, bool);
+bool acpi_wakeup_gpe_shared(struct acpi_device *, struct acpi_device *);
+#else /* !CONFIG_PM_WAKEUP */
static inline int acpi_pm_device_sleep_state(struct device *d, int *p)
{
if (p)
*p = ACPI_STATE_D0;
return ACPI_STATE_D3;
}
+
static inline int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
{
return -ENODEV;
}
-#endif /* !CONFIG_PM_SLEEP */
+
+static inline int acpi_device_run_wake(struct device *dev, bool enable)
+{
+ return -ENODEV;
+}
+
+static inline bool acpi_wakeup_gpe_shared(struct acpi_device *a,
+ struct acpi_device *b)
+{
+ return false;
+}
+#endif /* !CONFIG_PM_WAKEUP */
#endif /* CONFIG_ACPI */
===================================================================
@@ -236,3 +236,8 @@ config PM_RUNTIME
and the bus type drivers of the buses the devices are on are
responsible for the actual handling of the autosuspend requests and
wake-up events.
+
+config PM_WAKEUP
+ bool
+ depends on SUSPEND || HIBERNATION || PM_RUNTIME
+ default y
===================================================================
@@ -602,7 +602,7 @@ int acpi_suspend(u32 acpi_state)
return -EINVAL;
}
-#ifdef CONFIG_PM_SLEEP
+#ifdef CONFIG_PM_WAKEUP
/**
* acpi_pm_device_sleep_state - return preferred power state of ACPI device
* in the system sleep state given by %acpi_target_sleep_state
@@ -717,7 +717,7 @@ int acpi_pm_device_sleep_wake(struct dev
return error;
}
-#endif
+#endif /* CONFIG_PM_WAKEUP */
static void acpi_power_off_prepare(void)
{
===================================================================
@@ -577,6 +577,9 @@ static int __devinit acpi_pci_root_add(s
if (flags != base_flags)
acpi_pci_osc_support(root, flags);
+ if (device->wakeup.flags.valid)
+ pci_acpi_add_bus_pm_notifier(device, root->bus);
+
return 0;
end:
@@ -598,6 +601,8 @@ static int acpi_pci_root_remove(struct a
{
struct acpi_pci_root *root = acpi_driver_data(device);
+ if (device->wakeup.flags.valid)
+ pci_acpi_remove_bus_pm_notifier(device, root->bus);
kfree(root);
return 0;
}
===================================================================
@@ -11,6 +11,20 @@
#include <linux/acpi.h>
#ifdef CONFIG_ACPI
+extern acpi_status pci_acpi_add_hp_notifier(acpi_handle handle,
+ acpi_notify_handler handler,
+ void *context);
+extern acpi_status pci_acpi_remove_hp_notifier(acpi_handle handle,
+ acpi_notify_handler handler);
+extern acpi_status pci_acpi_add_device_pm_notifier(struct acpi_device *dev,
+ struct pci_dev *pci_dev);
+extern acpi_status pci_acpi_remove_device_pm_notifier(struct acpi_device *dev,
+ struct pci_dev *pci_dev);
+extern acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
+ struct pci_bus *bus);
+extern acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev,
+ struct pci_bus *bus);
+
static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev)
{
struct pci_bus *pbus = pdev->bus;
===================================================================
@@ -26,6 +26,7 @@
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
+#include <linux/pci-acpi.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
@@ -38,7 +39,17 @@ static int acpi_pci_unbind(struct acpi_d
struct pci_dev *dev;
dev = acpi_get_pci_dev(device->handle);
- if (!dev || !dev->subordinate)
+ if (!dev)
+ goto out;
+
+ if (device->wakeup.flags.valid) {
+ if (dev->subordinate)
+ pci_acpi_remove_bus_pm_notifier(device,
+ dev->subordinate);
+ pci_acpi_remove_device_pm_notifier(device, dev);
+ }
+
+ if (!dev->subordinate)
goto out;
acpi_pci_irq_del_prt(dev->subordinate);
@@ -94,6 +105,12 @@ static int acpi_pci_bind(struct acpi_dev
acpi_pci_irq_add_prt(device->handle, bus);
+ if (device->wakeup.flags.valid) {
+ pci_acpi_add_device_pm_notifier(device, dev);
+ if (dev->subordinate)
+ pci_acpi_add_bus_pm_notifier(device, dev->subordinate);
+ }
+
out:
pci_dev_put(dev);
return 0;
===================================================================
@@ -238,8 +238,7 @@ register_slot(acpi_handle handle, u32 lv
/* install notify handler */
if (!(newfunc->flags & FUNC_HAS_DCK)) {
- status = acpi_install_notify_handler(handle,
- ACPI_SYSTEM_NOTIFY,
+ status = pci_acpi_add_hp_notifier(handle,
handle_hotplug_event_func,
newfunc);
@@ -290,14 +289,12 @@ static void init_bridge_misc(struct acpi
/* install notify handler */
if (bridge->type != BRIDGE_TYPE_HOST) {
if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
- status = acpi_remove_notify_handler(bridge->func->handle,
- ACPI_SYSTEM_NOTIFY,
+ status = pci_acpi_remove_hp_notifier(bridge->func->handle,
handle_hotplug_event_func);
if (ACPI_FAILURE(status))
err("failed to remove notify handler\n");
}
- status = acpi_install_notify_handler(bridge->handle,
- ACPI_SYSTEM_NOTIFY,
+ status = pci_acpi_add_hp_notifier(bridge->handle,
handle_hotplug_event_bridge,
bridge);
@@ -513,15 +510,14 @@ static void cleanup_bridge(struct acpiph
acpi_status status;
acpi_handle handle = bridge->handle;
- status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+ status = pci_acpi_remove_hp_notifier(handle,
handle_hotplug_event_bridge);
if (ACPI_FAILURE(status))
err("failed to remove notify handler\n");
if ((bridge->type != BRIDGE_TYPE_HOST) &&
((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func)) {
- status = acpi_install_notify_handler(bridge->func->handle,
- ACPI_SYSTEM_NOTIFY,
+ status = pci_acpi_add_hp_notifier(bridge->func->handle,
handle_hotplug_event_func,
bridge->func);
if (ACPI_FAILURE(status))
@@ -539,8 +535,7 @@ static void cleanup_bridge(struct acpiph
unregister_dock_notifier(&func->nb);
}
if (!(func->flags & FUNC_HAS_DCK)) {
- status = acpi_remove_notify_handler(func->handle,
- ACPI_SYSTEM_NOTIFY,
+ status = pci_acpi_remove_hp_notifier(func->handle,
handle_hotplug_event_func);
if (ACPI_FAILURE(status))
err("failed to remove notify handler\n");
@@ -602,7 +597,7 @@ static void remove_bridge(acpi_handle ha
if (bridge)
cleanup_bridge(bridge);
else
- acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
+ pci_acpi_remove_hp_notifier(handle,
handle_hotplug_event_bridge);
}
@@ -1492,8 +1487,8 @@ find_root_bridges(acpi_handle handle, u3
int *count = (int *)context;
if (acpi_is_root_bridge(handle)) {
- acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
- handle_hotplug_event_bridge, NULL);
+ pci_acpi_add_hp_notifier(handle,
+ handle_hotplug_event_bridge, NULL);
(*count)++;
}
return AE_OK ;